—Which coat is________,the black one or the gray one?—The black one,of course.
—We should _______ humans from ________ down too many trees. —I agree with you. Trees are very important to us.
—I have no idea ____________ tell her the bad news. —I think tomorrow is the best time.
—Neither Mary nor her friends _________ joined the music club because they have no time. — It’s a pity!
Mr. Li will go to Guangzhou by air. His workmates are ______ him off at the airport.
—You should ________ your son. He works harder than before.—Thanks, I will.